Optimal Transmission of Interface Vibration Wavelets—A Simulation of Seabed Seismic Responses

Seismic interface waves generated by seabed impacts are believed to have biological importance. Previous work on the effects of ocean piling and dredging studied water motion adjacent to the seabed, using sediment measurements as reviewed in the literature. This new modelling work has idealised the...

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Main Authors: Richard A. Hazelwood, Patrick C. Macey, Stephen P. Robinson, Lian S. Wang
Format: Article
Language:English
Published: MDPI AG 2018-05-01
Series:Journal of Marine Science and Engineering
Subjects:
Online Access:http://www.mdpi.com/2077-1312/6/2/61
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spelling doaj-56ec5446e6a64bf8b494a72396362c102021-04-02T03:19:24ZengMDPI AGJournal of Marine Science and Engineering2077-13122018-05-01626110.3390/jmse6020061jmse6020061Optimal Transmission of Interface Vibration Wavelets—A Simulation of Seabed Seismic ResponsesRichard A. Hazelwood0Patrick C. Macey1Stephen P. Robinson2Lian S. Wang3R&V Hazelwood Associates LLP, Guildford GU2 8UT, UKPACSYS Ltd., Nottingham NG8 6PE, UKNational Physical Laboratory, Teddington TW110LW, UKNational Physical Laboratory, Teddington TW110LW, UKSeismic interface waves generated by seabed impacts are believed to have biological importance. Previous work on the effects of ocean piling and dredging studied water motion adjacent to the seabed, using sediment measurements as reviewed in the literature. This new modelling work has idealised the sediment data to a simple model with few parameters, and has shown how this leads to filtration of the applied energy to propagate simple seismic vibration wavelets. These special wavelets remain compact with high peak levels of the associated water particle velocity as they ripple outward, and provide a means of assessing the worst-case environmental impact. The form of this wavelet morphs from a hump shape to a dip and back, via intermediate forms which are here described in mathematical terms based on the Ricker form. Whilst the model structure is idealised it is much closer to reality than the Rayleigh and Scholte half-space models, but with only two more parameters required. The resultant wavelet peaks are propagated with values given by the optimal limit case of cylindrical spreading (ignoring absorption) which results in a relatively widespread impact.http://www.mdpi.com/2077-1312/6/2/61seismic waveletwater particle velocityseabed piling impactRicker
collection DOAJ
language English
format Article
sources DOAJ
author Richard A. Hazelwood
Patrick C. Macey
Stephen P. Robinson
Lian S. Wang
spellingShingle Richard A. Hazelwood
Patrick C. Macey
Stephen P. Robinson
Lian S. Wang
Optimal Transmission of Interface Vibration Wavelets—A Simulation of Seabed Seismic Responses
Journal of Marine Science and Engineering
seismic wavelet
water particle velocity
seabed piling impact
Ricker
author_facet Richard A. Hazelwood
Patrick C. Macey
Stephen P. Robinson
Lian S. Wang
author_sort Richard A. Hazelwood
title Optimal Transmission of Interface Vibration Wavelets—A Simulation of Seabed Seismic Responses
title_short Optimal Transmission of Interface Vibration Wavelets—A Simulation of Seabed Seismic Responses
title_full Optimal Transmission of Interface Vibration Wavelets—A Simulation of Seabed Seismic Responses
title_fullStr Optimal Transmission of Interface Vibration Wavelets—A Simulation of Seabed Seismic Responses
title_full_unstemmed Optimal Transmission of Interface Vibration Wavelets—A Simulation of Seabed Seismic Responses
title_sort optimal transmission of interface vibration wavelets—a simulation of seabed seismic responses
publisher MDPI AG
series Journal of Marine Science and Engineering
issn 2077-1312
publishDate 2018-05-01
description Seismic interface waves generated by seabed impacts are believed to have biological importance. Previous work on the effects of ocean piling and dredging studied water motion adjacent to the seabed, using sediment measurements as reviewed in the literature. This new modelling work has idealised the sediment data to a simple model with few parameters, and has shown how this leads to filtration of the applied energy to propagate simple seismic vibration wavelets. These special wavelets remain compact with high peak levels of the associated water particle velocity as they ripple outward, and provide a means of assessing the worst-case environmental impact. The form of this wavelet morphs from a hump shape to a dip and back, via intermediate forms which are here described in mathematical terms based on the Ricker form. Whilst the model structure is idealised it is much closer to reality than the Rayleigh and Scholte half-space models, but with only two more parameters required. The resultant wavelet peaks are propagated with values given by the optimal limit case of cylindrical spreading (ignoring absorption) which results in a relatively widespread impact.
topic seismic wavelet
water particle velocity
seabed piling impact
Ricker
url http://www.mdpi.com/2077-1312/6/2/61
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